31 lines
1.1 KiB
HTML
31 lines
1.1 KiB
HTML
[appendix]
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== TeleGPS System Operation
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=== GFSK Telemetry
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TeleGPS's native telemetry system doesn't use a
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'normal packet radio' mode like APRS because it's not
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very efficient. The GFSK modulation we use is FSK
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with the base-band pulses passed through a Gaussian
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filter before they go into the modulator to limit the
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transmitted bandwidth. When combined with forward
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error correction and interleaving, this allows us to
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have a very robust 19.2 kilobit data link with only
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10-40 milliwatts of transmit power, a whip antenna in
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the rocket, and a hand-held Yagi on the ground. We've
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had flights to above 21k feet AGL with great
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reception, and calculations suggest we should be good
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to well over 40k feet AGL with a 5-element yagi on the
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ground with our 10mW units and over 100k feet AGL with
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the 40mW devices.
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:aprsdevices: TeleGPS
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:configure_section: _configure_device
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include::aprs-operation.adoc[]
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=== Configurable Parameters
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Configuring TeleGPS is very simple; the few configurable
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parameters can all be set using the TeleGPS application over
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USB. Check out <<_configure_device>>.
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